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Signalling of Quality of Service Within Public Telephony Networks. April 26, 2001. Presented by Greg Ratta ( ), ITU-T SG 11 Vice Chairman. Outline. Introduction - elements of QoS signalling Signaling of QoS in B-ISDN Overview of BICC QoS signalling for BICC

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Signalling of Quality of Service

Within Public Telephony Networks

April 26, 2001

Presented by Greg Ratta ( ), ITU-T SG 11 Vice Chairman


  • Introduction - elements of QoS signalling

  • Signaling of QoS in B-ISDN

  • Overview of BICC

  • QoS signalling for BICC

  • Summary

Atm service categories
ATM Service Categories

*CDVT is a network characteristic and is not signaled

 = network specific

Guaranteed Frame Rate (GFR)

  • Objective: a non-real-time service that provides some QoS commitment while placing minimal constraints on the user

  • Major Application: Carry aggregate TCP/IP traffic between two routers

  • User is free to send any rate up to a PCR all the time, but network commitment is only to an MCR

  • GFR service is “frame-based.”

Inclusion of QoS parameters in the SETUP message when the I.356 QoS class is explicitly requested (QoS value different from 0)

Inclusion of QoS parameters in the SETUP message when the QoS class value is not explicitly requested and the requested ATC is an I.371 ATC

What is bicc
What is BICC? for backward compatibility

  • BICC provides a means of supporting narrowband ISDN services across a broadband backbone network without impacting the interfaces to the existing N-ISDN network and end-to-end services.

  • The BICC call control signaling protocol is based on N-ISUP signaling

  • The bearer control signaling protocols are based on different bearer technology control signaling protocols (e.g., DSS2 for AAL type 1 and AAL type 2)

  • The BICC call control signaling protocol should not be aware of the actual bearer transport being employed. The binding information is used to reference the bearer.

Bicc network architecture
BICC network architecture for backward compatibility

Bicc capability set 1
BICC Capability Set 1 for backward compatibility

  • Forward and Backward Backbone Network Establishment

  • Transport Call Control via MTP SS7 or ATM

  • Support of most existing narrow band services.

  • New Backbone Network Connection (BNC) with or without Codec Negotiation

  • Reuse of Idle Backbone Network Connection (BNC)

  • Separate Release of Call and Backbone Network Connection (BNC)

  • Bearer Transport Types supported: AAL 1 & AAL 2

Bicc capability set 2 and beyond
BICC Capability Set 2 and Beyond for backward compatibility

  • Extend BICC to the Local Exchanges

  • Support IP Bearer, including Tunnelling

  • Support of a Call Mediation Node Function

  • Support Structured AAL1

  • New Identifiers

    • Traffic Group

    • Global Call Reference

  • Extend BICC to Special Resources Nodes (e.g., announcement platforms…etc)

Qos signalling in bicc cs 3
QoS Signalling in BICC CS 3 for backward compatibility

  • Based on the TIPHON specifications for end-to-end QoS control

    • 4 TIPHON QoS service classes (Best, High, Medium and Best Effort) in ETSI TS 101 329 part 2

    • the signalling and control of end-to-end QoS in TIPHON systems in ETSI TS 101 329 part 3.

  • Initiated joint activity with ITU-T SG 16 for:

    • Translation of the TIPHON defined QoS requirements and signalling flows in protocol requirements.

    • Definition of generic procedures in call/bearer control protocols (BICC, H.225/H.245, SIP/SDP) for end-to-end QoS service control.

    • The specification of a generic H.248 (Megaco) package for end-to-end QoS service control.

Summary for backward compatibility

  • All new services in ITU-T SG 11 to be specified for BICC before being added to ISUP or BISUP

  • QoS signalling available for ATM-based infrastructure

  • Capability for call level QoS signalling under study

Bicc acronyms

AAL ATM Adaptation Layer for backward compatibility

ACF Access Control Function

ACN Access Concentration Node

AESA ATM End System Address

AGI Application Generated Identifier

ANI Access Network Interface

APM Application transport Message

ATM Asynchronous Transfer Mode

BCF Bearer Control Function

BF Bearer Function

BICC Bearer Independent Call Control

BIWF Bearer Interworking Function

BNC Backbone Network Connection

CSF Call Service Function

CSM Call State Model

CMN Call Mediation Node

B-ISUP Broadband ISUP

DSS2 Digital Signalling System no.2

GAT Generic Addressing and Transport protocol

GFT Generic Function Transport control

GIT Generic Identifier Transport

GSN Gateway Serving Node

BICC Acronyms

  • IN Intelligent Networks

  • IP Internet Protocol

  • ISDN Integrated Services Digital Network

  • ISN Interface Serving Node

  • ISUP ISDN User Part

  • MTP3b Message Transfer Part no.3b

  • NNI Network-Network Interface

  • POP Point of Presence

  • PSTN Public Switched Telephony Network

  • SN Serving Node

  • SPOI Signalling Point of Interconnection

  • SS7 Signalling System no.7

  • SSCOP Service-Specific Connection-Oriented Protocol

  • STP Signalling Transfer Point

  • SWN Switching Node

  • TDM Time Division Multiplexing

  • TE Terminal Equipment

  • TG Trunk Group

  • TSN Transit Serving Node

  • UNI User Network Interface

  • VCC Virtual Channel Connection

  • VoIP Voice-over-IP